[PATCH] gpio: rgpio2p: Enhance reading of GPIO pin value

[Fabio Estevam]

On Mon, Jan 24, 2022 at 5:50 PM Fabio Estevam <festevam at gmail.com> wrote:
>
> [Adding the NXP folks to help reviewing it]

Sorry, added the NXP Linux folks instead of the NXP U-Boot folks.

>
> On Mon, Jan 24, 2022 at 5:46 PM Christoph Fritz
> <chf.fritz at googlemail.com> wrote:
> >
> > Add support for reading GPIO pin value when function is output.
> > With this patch applied, gpio toggle command is working.
> >
> > Signed-off-by: Christoph Fritz <chf.fritz at googlemail.com>
> > ---
> >  drivers/gpio/imx_rgpio2p.c | 14 +++++++++++++-
> >  1 file changed, 13 insertions(+), 1 deletion(-)
> >
> > diff --git a/drivers/gpio/imx_rgpio2p.c b/drivers/gpio/imx_rgpio2p.c
> > index 0e2874ca95c..175e460aff5 100644
> > --- a/drivers/gpio/imx_rgpio2p.c
> > +++ b/drivers/gpio/imx_rgpio2p.c
> > @@ -39,6 +39,14 @@ static int imx_rgpio2p_is_output(struct gpio_regs *regs, int offset)
> >         return val & (1 << offset) ? 1 : 0;
> >  }
> >
> > +static int imx_rgpio2p_bank_get_direction(struct gpio_regs *regs, int offset)
> > +{
> > +       if ((readl(&regs->gpio_pddr) >> offset) & 0x01)
> > +               return IMX_RGPIO2P_DIRECTION_OUT;
> > +
> > +       return IMX_RGPIO2P_DIRECTION_IN;
> > +}
> > +
> >  static void imx_rgpio2p_bank_direction(struct gpio_regs *regs, int offset,
> >                                     enum imx_rgpio2p_direction direction)
> >  {
> > @@ -67,7 +75,11 @@ static void imx_rgpio2p_bank_set_value(struct gpio_regs *regs, int offset,
> >
> >  static int imx_rgpio2p_bank_get_value(struct gpio_regs *regs, int offset)
> >  {
> > -       return (readl(&regs->gpio_pdir) >> offset) & 0x01;
> > +       if (imx_rgpio2p_bank_get_direction(regs, offset) ==
> > +           IMX_RGPIO2P_DIRECTION_IN)
> > +               return (readl(&regs->gpio_pdir) >> offset) & 0x01;
> > +
> > +       return (readl(&regs->gpio_pdor) >> offset) & 0x01;
> >  }
> >
> >  static int  imx_rgpio2p_direction_input(struct udevice *dev, unsigned offset)
> > --
> > 2.30.2
> >
> >
> >